| 摘要 |
PROBLEM TO BE SOLVED: To improve Q-value reduction caused by a thermo-elastic loss incurred in a supporting part by bending vibration of vibrating arms, in a bending vibrating piece in which a plurality of vibrating arms are integrally supported inside a frame by the supporting part. SOLUTION: A piezoelectric vibrating piece 11 includes a pair of parallel vibrating arms 14, 15 extending across the inside of a rectangular frame 12 and extending from a supporting part 13 with both the terminals thereof coupled to the frame. A groove 18 with a bottom or a through groove 21 is formed on each of front and rear principal surfaces of the supporting part. For the groove with the bottom, a heat transfer route between a portion 19 of the supporting part at the side of the vibrating arms and a portion 20 at the side of the frame is apparently long and a relaxation time between these portions becomes long, so that the number of relaxing vibration to minimize a Q value is decreased as compared with the prior arts and the Q value is improved. For the through groove, the heat transfer route between the portion at the vibrating arm side and the portion at the frame side becomes short and the relaxation time of each portion becomes short, so that the number of relaxing vibration is increased as compared with the prior arts and the Q value is improved. COPYRIGHT: (C)2010,JPO&INPIT
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